Double-Row Angular
Contact Roller Rings
RW
Adopts double-row rollers.
Achieves high rigidity, high accuracy and compactness.
Directly mounts securely, no presser flange required.
For details, visit THK at www.thk.com
＊Product information is updated regularly on the THK website.
CATALOG No.361E
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Double-Row Angular
Contact Roller Rings
Double-row, and simple.
Achieves high rigidity, high accuracy and compactness.
By integrating double-row small-diameter rollers on the raceway, the number of rollers
incorporated in this new model (RW228) is approximately 5 times that of Cross-Roller
Ring model RU*. While maintaining the compactness, it achieves higher rigidity and
accuracy and a lower torque. In addition, the inner and outer rings in integrated
structures have mounting holes, allowing the product to be directly mounted to the
machine.
* Previous Cross-Roller Ring model RU
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● Adopts Inner and Outer Rings that has Integrated Structures
High rigidity and high accuracy
● Utilizes Small-diameter Rollers
Lower torque
The inner ring and the outer ring of model RW have integral structures to realize a
Model RW adopts small-diameter rollers to reduce the friction coefficient and realize a
high level of part rigidity. Since the inner ring and the outer ring are machined to
lower torque and low-temperature rise characteristics.
have mounting bolt holes, and the size and number of the mounting bolt holes are
optimally designed, the deformation of the raceway resulting from the mounting can
be minimized and stable rotational performance can be achieved. In addition, the
● Adopts Double-row Unidirectional Rollers
increased machining accuracy results in high rotational accuracy (see Accuracy
Standards on page 5).
Increased rigidity
Despite having almost the same dimensions as the previous Cross-Roller Ring model
Optimal design of the mounting hole
RU*, model RW has rows of raceways twice that of model RU and has a DB structure to
increase the rigidity.
High rigidity with a integrated outer ring structure
Inner ring (with mounting holes)
High rigidity with a integrated inner ring structure
Double-row unidirectional rollers
Outer ring (with mounting holes)
×10-4
Theoretical Rigidity Comparison between RU228 and RW228
θ [rad]
RU228
RW228
Moment [kN-m]
×10-4
Theoretical Rigidity Comparison between RU297 and RW297
θ [rad]
RU297
RW297 Moment [kN-m]
×10-4
Theoretical Rigidity Comparison between RU445 and RW445
θ [rad]
RU445
RW445
Moment [kN-m]
●RW228
●RW297
●RW445
(outer diameter: 295 mm; inner diameter: 160 mm)
(outer diameter: 380 mm; inner diameter: 210 mm)
(outer diameter: 540 mm; inner diameter: 350 mm)
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Product Overview
Double-Row Angular Contact Roller Rings <RW>
Nominal Life
The service life is obtained from the following equation.
fT・C
L＝
fw・PC
10
3
（ ）
106
Temperature factor fT
[Nominal Life]
1.0
0.9
0.8
0.7
0.6
0.5
100
150
200
250
Temperature of the bearing unit (°C)
L :
C
PC
fT
fW
:
:
:
:
Nominal life
(the total number of revolutions that 90% of a group of identical
Double-Row Angular Contact Roller Rings units operating under
the same conditions can achieve without showing flaking from
rolling fatigue)
Basic dynamic load rating* [N]
Dynamic equivalent radial load [N]
Temperature factor (see Fig. 1)
Load factor (see Table 1)
* The basic dynamic load rating (C) of model RW shows the radial load with interlocked
direction and magnitude, under which the nominal life (L) is 1 million revolutions when a
Fig. 1 Temperature factor (fT)
Note) The normal service temperature is 80°C or below. If the product is to be used
at a higher temperature, contact THK.
Table 1 Load Factor (fw)
Service conditions
fw
Smooth motion without impact
1 to 1.2
Normal motion
1.2 to 1.5
group of identical model RW units independently operate under the same conditions. The
basic dynamic load rating (C) is indicated in the specification tables.
Motion with severe impact
[Dynamic Equivalent Radial Load: PC]
1.5 to 3
Moment
(M)
The dynamic equivalent radial load is obtained from the
following equation.
Axial load
(Fa)
（
PC＝X・ Fr＋
2M
＋Y・Fa
dp
）
PC :
Dynamic equivalent radial
load [N]
X :
Fr :
Fa :
M :
Radial load [N]
Axial load [N]
Moment [N-mm]
Y :
dp :
Dynamic radial factor (see
Table 2)
Dynamic axial factor (see
Table 2)
Roller pitch circle diameter [mm]
If Fr = 0 [N] and M = 0 [N-mm], assume that X = 0.67 and Y =
0.67.
For service life calculation with a preload taken into account,
contact THK.
Radial load
(Fr)
Moment
(M)
Table 2 Dynamic Radial Factor and Dynamic Axial Factor
Classification
Fa
Fr＋2M／dp
Fa
Fr＋2M／dp
X
Y
≦1.5
1
0.45
＞1.5
0.67
0.67
[Calculating the Service Life Time]
The service life time of model RW is obtained from the
following equation.
For Rotary Motion
Lh＝
Lh :
L
nr 60
Service life time [h]
nr :
Rotation speed per minute
[min-1]
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Static Safety Factor
The basic static load rating C0 refers to the static load with constant direction and magnitude, under which the calculated
contact stress in the center of the contact area between the roller and the raceway load is 4,000 [MPa] (if the contact stress
exceeds this value, performance may be affected). This value is indicated as “C 0” in the specification tables. When a load is
statically or dynamically applied, it is necessary to consider the static safety factor as shown below.
Table 3 Static Safety Factor (fS)
C0
＝fs
P0
fS :
C0 :
P0 :
Load conditions
Lower limit of fS
Normal load
1 to 2
Impact load
2 to 3
Static safety factor (see Table 3)
Basic static load rating [N]
Static equivalent radial load [N]
[Static Equivalent Radial Load: P0]
Moment
(M)
The static equivalent radial load of model RW is obtained
from the following equation.
Axial load
(Fa)
2M
P0＝X0・ Fr＋
＋Y0・Fa
dp
（
P0 :
Fr :
Fa :
M :
）
Static equivalent radial load [N]
Radial load [N]
Axial load [N]
Moment [N-mm]
X0 :
Y0 :
dp :
Radial load
(Fr)
Moment
(M)
Static radial factor (X0 = 1)
Static axial factor (Y0 = 0.44)
Roller pitch circle diameter [mm]
Permissible Load
Table 4 shows the permissible load of model RW.
The permissible load value takes into account the tightening
strength of the mounting bolts. Consider the difference in
the permissible loads between with and without a housing.
If the applied radial load or moment is large, it is
Recommended to insert the product into a housing. (For
housing design, also see sections “Fit” and “Designing
Peripheral Parts” on page 6).
Without housing
With housing
Table 4 Permissible Load of Model RW
Without housing
With housing
Model No.
Radial [kN]
Axial [kN]
Moment [kN-m]
Radial [kN]
Axial [kN]
Moment [kN-m]
RW228
7.5
54.4
2.3
26.6
54.4
3.0
RW297
12.1
97.1
5.0
47.6
97.1
7.1
RW445
16.2
219
9.8
107
219
24
4
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Product Overview
Double-Row Angular Contact Roller Rings <RW>
Accuracy Standards
Model RW is manufactured with the accuracy and the dimensional tolerance in Tables 5 to 8.
[Rotational Accuracy]
Table 5 Rotational Accuracy of the Inner Ring of Model RW
Unit: μm
Radial runout tolerance of the inner ring
Axial runout tolerance of the inner ring
Model No.
Grade P5
Grade P4
Grade P2
Grade USP
Grade TSP
Grade P5
Grade P4
Grade P2
Grade USP
Grade TSP
RW228
8
6
5
2.5
2.5
8
6
5
2.5
2.5
RW297
10
8
5
3
3
10
8
5
3
3
RW445
15
12
7
4
4
15
12
7
4
4
Note) For model RW, grade P5 is the standard rotational accuracy. (Not indicated in model number.)
Table 6 Rotational Accuracy of the Outer Ring of Model RW
Unit: μm
Radial runout tolerance of the outer ring
Axial runout tolerance of the outer ring
Model No.
Grade P5
Grade P4
Grade P2
Grade USP
Grade P5
Grade P4
Grade P2
Grade USP
RW228
18
11
7
4
18
11
7
4
RW297
20
13
8
5
20
13
8
5
RW445
25
16
10
7
25
16
10
7
Note) For model RW, grade P5 is the standard rotational accuracy. (Not indicated in model number.)
[Wobbling Accuracy (Inner Ring of Grade TSP Only)]
Probe
Height measurement
Wobbling Accuracy refers to the pure rotational accuracy
of the bearing calculated by subtracting the profile accuracy
(roundness and flatness) from the rotational accuracy of
the bearing.
Measurement conditions: “height measurement” = “roller pitch circle
diameter”
Table 7 Wobbling Accuracy of Model RW
Unit: μm
Grade TSP
Model No.
Radial direction
Axial direction
RW228
2
2
RW297
2
2
RW445
2
2
Roller pitch circle diameter
Method for wobbling accuracy measurement
[Dimensional Accuracy]
Table 8 Dimensional Tolerance of Bearing Inner Diameter, Outer Diameter and Width of Model RW
Unit: μm
Dimensional tolerance of bearing inner diameter dm Dimensional tolerance of bearing outer diameter Dm
Dimensional tolerance of bearing width B
Model No.
Upper
Lower
Upper
Lower
Upper
Lower
RW228
0
−25
0
−35
0
−100
RW297
0
−30
0
−40
0
−100
RW445
0
−40
0
−50
0
−150
Note) dm and Dm represent the arithmetic mean values of the maximum diameter and the minimum diameter obtained through two-point measurement of the bearing inner
diameter and the bearing outer diameter.
5
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Radial Clearance
The radial clearance of model RW is adjusted to a negative
value (preloaded) before shipment, which is controlled with
the starting torque of the product.
Table 9 shows the specification values for the starting
torque of model RW.
Table 9 Radial Clearance of Model RW
Starting torque [N-m]
Model No.
Minimum
Maximum
RW228
1
10
RW297
3
20
RW445
10
65
Note) The starting torque does not include seal resistance.
Fit
Although the design of model RW does not require a fitted housing, if positioning accuracy is required or a large load is
applied, it is recommended to insert the product into a housing with a fit tolerance of g6 for the shaft and H7 for the hole (also
see section “Permissible Load” on page 4, and section “Designing Peripheral Parts” below).
If higher rigidity is required, it is recommended to measure the inner and outer diameters of the bearing and to use a slight
interference fit (approximately 0 to 5 μm) that corresponds to the measurements.
* If an interference fit is used, provide tapped hole for ring removal in the bearing/housing.
Designing Peripheral Parts
Table 10 shows the recommended machining accuracy for the peripheral parts (shaft and housing) to which model RW is to be installed.
Table 10 Recommended Machining Accuracy of Model RW s Mating Part
Above
Or less
Roundness
Perpendicularity
Flatness
[μm]
120
180
5
180
250
7
250
315
8
315
400
9
400
500
10
500
630
11
Standard dimension d, D [mm]
Table 10 A
Table 10
φd
A
Table 10
φD
B
Table 10
For the fit depth of the housing, see Table 11 as a guide.
Table 11 Housing Fit Depth for Model RW
Table 10 B
Table 10
Machining accuracy of peripheral part
Fit depth: H
If positioning accuracy is required
0.15 to 0.25×B
If an applied load is large
0.50 to 0.75×B
If high rigidity is required
0.75 to 1.00×B
B
Use of fit
H
H:Fit depth
B:Bearing width
Fit depth of the housing
For the mating bolt holes for securing model RW-X, the values in Table 12 are recommended.
Recommended bolt hole dimensions
Model No.
φd2
Unit: mm
h
Table 12 Recommended Bolt Hole Dimensions of the Mating Part for Model RW-X
Bolt size
d1
d2
h
RW228
M6
7
11
6.5
RW297
M8
9.3
14.5
8.6
RW445
M8
9.3
14.5
8.6
φd1
6
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Product Overview
Double-Row Angular Contact Roller Rings <RW>
Procedure for Assembly
When assembling model RW, follow the steps below.
[Inspect the parts prior to assembly]
Thoroughly clean the housing and other parts to be assembled, and make sure that no burrs or knots are present.
[Install the bearing to the housing or shaft]
The product tends to tilt during installation. To prevent this, gradually drive the product into the housing or onto the shaft by gently tapping it with a
plastic or copper mallet while keeping it perpendicular. Continue to tap until the bearing is properly contacting the reference surface.
Note) When installing the inner ring, only tap the inner ring; when installing the outer ring, only tap the outer ring.
[Tighten the mounting bolts]
(1) Install and align the ring with the required rotational accuracy.
(2) Place model RW onto the housing. Align model RW with the mounting holes.
(3) Insert the securing bolts into the holes. Turn the bolts by hand to make sure they do not show skewing which indicates misalignment of the holes.
(4) Fasten the mounting bolts in three to four steps from loose to fully fastened. Secure the bolts in a diagonal order. (Figure 1)
(5) When tightening the securing bolts, use a torque wrench and evenly tighten the bolts according to the values in Table 13.
17
1
9
24
16
5
25
13
4
22
19
14
7
23
2
10
12
29
Model No.
Bolt size
Tightening torque
[N-m]
RW228
M6
14
RW297
M8
30
RW445
M8
30
20
3
4
19
30
11
14
27
22
7
6
15
28
13
12
3
8
21
20
11
Table 13 Bolt Tightening Torque for Mounting Model RW
24
5
8
21
1 32
9 17
16
6
23
18
In the case of 24 bolts
15 31
10
2 18
26
In the case of 32 bolts
Figure 1: Example of bolt tightening sequence
Permissible Rotation Speed
Table 14 shows the permissible rotation speed of model RW.
Table 14 Permissible Rotation Speed of Model RW
Model No.
Permissible rotation speed
[min-1]
RW228
350
RW297
270
RW445
180
Note 1) The values in Table 14 assume operation under no load.
If a large load is applied or the permissible rotation speed is exceeded,
contact THK.
Note 2) Depending on the lubrication or the load conditions, the product may
generate considerable heat.
[Lubrication Specifications]
For the lubrication specifications of model RW, the lubricants in Table 15 are recommended.
Model RW contains THK AFB-LF Grease as standard.
Table 15 Recommended Lubrication Specifications
Lubrication specifications
Recommended lubricant
Grease lubrication
THK AFB-LF Grease
(standard grease)
Oil lubrication
ISO VG68 Oil
7
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Model Number Coding
RW297 UU CC0 P2 B G X −N
Option symbol
No Symbol : No accessory
-N : Grease nipple attached (A-PT1/8)
Inner Ring Hole symbol
No Symbol : Inner ring counterbore hole
X : Inner ring tapped hole (through hole)
Mounting Hole Orientation symbol【excluding X type】
No Symbol : The counterbore holes of the inner and
outer rings face the same direction
G : The counterbore holes of the inner and
outer rings face opposite direction
Sub-part Accuracy symbol
No Symbol : Rotational Accuracy of the Inner Ring
R : Rotational Accuracy of the Outer Ring
B : Rotational Accuracy of the Inner/Outer Rings
Accuracy symbol
No Symbol : 5-grade rotational accuracy
P4 : 4-grade rotational accuracy
P2 : 2-grade rotational accuracy
USP : USP-grade rotational accuracy
TSP : USP-grade rotational accuracy
+ wobbling accuracy
Radial clearance symbol
CC0 :Minus clearance (preload)
Seal symbol
No Symbol : Without seal
UU : Seal attached on both ends
U : Seal attached on either end
(counterbore side of the outer ring)
UT : Seal attached on either end
(opposite to the counter-bore of the outer ring)
Model No.
8
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Dimensional Table
Double-Row Angular Contact Roller Rings <RW>
2-greasing hole
PCD2
PCD1
L2
L1
2-greasing hole
φd
B
r
r
φD
RW228 to RW445
RW228G to RW445G
RW228X to RW445X
Main dimensions
Model No.
Inner
diameter
Roller
Outer
pitch circle
diameter
diameter
Width
Shoulder height
Greasing hole
Basic load rating
(radial)
C
C0
d
D
dp
B
Hole
diameter
L1
L2
rmin
ds
Dh
[kN]
[kN]
160
295
228.8
35
Rc1/8
10.5
24.5
2
220
240
58.4
158
210
380
299.2
40
Rc1/8
12
28
2.5
285
315
101
287
350
540
445.4
50
Rc1/8
15
35
2.5
425
465
214
647
RW228（G）
RW228X
RW297（G）
RW297X
RW445（G）
RW445X
9
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PCD2
Model RW
φds
Model RW…UU
PCD1
Model RW…U
φDh
Model RW…UT
Option
10
19.5
* Accessories for lubrication (piping joint, grease fitting,
11.5
etc.) other than the standard option may also be
attached.
For inquiry, contact THK (for other accessories for
R1/8
lubrication, see section “Lubrication Accessories” in
11.5
the general catalog).
Grease nipple (type A-PT1/8)
Unit: mm
Mass
Mounting hole dimensions
Inner ring
[kg]
PCD1
12
184
Outer ring
Mounting hole
PCD 2
Model No.
Mounting hole
24-φ7 through φ11 counterbore depth 24.5
RW228（G）
270
24-φ7 through φ11 counterbore depth 24.5
24-M6 depth 18
RW228X
24-φ9.3 through φ14.5 counterbore depth 28
22
240
RW297（G）
350
24-φ9.3 through φ14.5 counterbore depth 28
24-M8 depth 24
RW297X
32-φ9.3 through φ14.5 counterbore depth 35
47
385
RW445（G）
505
32-M8 depth 24
32-φ9.3 through φ14.5 counterbore depth 35
RW445X
10
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Double-Row Angular Contact Roller Rings RW
●Precautions on Handling
Precautions on Use
· Do not disassemble the Double-Row Angular Contact Roller Rings unit.
· Dropping or hitting the Double-Row Angular Contact Roller Rings unit may damage it. Applying an impact force to the product
could cause functional loss even if the product looks intact.
●Lubrication
· Since each Double-Row Angular Contact Roller Rings unit contains high-quality lithium soap group grease No. 2 (THK AFB-LF
Grease), you can start using the product without replenishing grease. However, the product requires regular lubrication since it
has a smaller internal space than ordinary roller bearings and because the rollers need frequent lubrication due to their rolling
contact structure.
To replenish grease, it is necessary to provide a grease path that leads to the oil holes formed on the circumference of the outer
ring. As for the lubrication interval, normally replenish grease of the same type while rotating the ring so that it is distributed
throughout the interior of the bearing at least every six to twelve months even if the product rotates infrequently.
When the bearing is filled up with grease, the initial rotational torque temporarily increases due to the resistance of the grease.
However, surplus grease will run out of the seals and the torque will return to the normal level in a short period.
· Do not mix greases with different physical properties.
· In locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature,
normal lubricants may not be used. Contact THK for details.
· When planning to use a special lubricant, or use the product other than with grease lubrication, contact THK before use.
●Precautions on Use
· Entrance of foreign material may cause functional loss. Prevent foreign material, such as dust or cutting chips, from entering
the product.
· Contact THK if you desire to use the product at a temperature above 80°C.
· Avoid an environment where a coolant may penetrate into the Double-Row Angular Contact Roller Rings unit.
· If foreign material adheres to the product, replenish the lubricant after cleaning the product with clean kerosene.
· When using the product in locations exposed to constant vibrations or in special environments such as clean rooms, vacuum
and low/high temperature, contact THK in advance.
· The seal of the Double-Row Angular Contact Roller Rings unit is a dust seal, and cannot prevent the entrance of fine dust or
liquid foreign material.
● “LM GUIDE,” and “
” are registered trademarks of THK CO., LTD.
● The photo may differ slightly in appearance from the actual product.
● The appearance and specifications of the product are subject to change without notice. Contact THK before placing an order.
● Although great care has been taken in the production of this catalog, THK will not take any responsibility for damage resulting from typographical errors or omissions.
● For the export of our products or technologies and for the sale for exports, THK in principle complies with the foreign exchange law and the Foreign Exchange
and Foreign Trade Control Law as well as other relevant laws.
All rights reserved
For export of THK products as single items, contact THK in advance.
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THK (SHANGHAI) CO.,LTD.
Phone:+86-21-6275-5280 Fax:+86-21-6219-9890
TAIWAN
THK TAIWAN CO.,LTD.
TAIPEI HEAD OFFICE
Phone:+886-2-2888-3818 Fax:+886-2-2888-3819
TAICHUNG OFFICE
Phone:+886-4-2359-1505 Fax:+886-4-2359-1506
TAINAN OFFICE
Phone:+886-6-289-7668
Fax:+886-6-289-7669
KOREA
SEOUL REPRESENTATIVE OFFICE
Phone:+82-2-3468-4351
Fax:+82-2-3468-4353
SINGAPORE
THK LM SYSTEM Pte. Ltd.
Phone:+65-6884-5500
Fax:+65-6884-5550
THAILAND
THK LM System Pte.Ltd.Representative Office in Thailand
Phone:+660-2751-3001
Fax:+660-2751-3003
INDIA
BANGALORE REPRESENTATIVE OFFICE
Phone:+91-80-2330-1524 Fax:+91-80-2330-1524
©THK CO., LTD.
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